Update fact-upgrade-sharded-cluster-prereq.rst

Unless I'm missing something here, the issue we identified with v:0 indexes isn't related to upgrade at all, and is no more or less likely after the upgrade.  We definitely want to encourage index upgrade, but not doing so won't make things worse.

Mention this because seeing customer concern about this warning in the docs.

Signed-off-by: Sam Kleinman <samk@10gen.com>
Fix include doc

This "include" is not working.
See http://docs.mongodb.org/manual/tutorial/add-user-to-database/

I'm pretty sure it's because it's too close to the line above (looking at the other "include"(s) in other docs)

Signed-off-by: Sam Kleinman <samk@10gen.com>
minor: tweaking list of links to fit with the new list idiom
DOCS-1714: 2.4 upgrade index issue
DOCS-1041: removing query document to clarify example
DOCS-1715: fixing formatting error
DOCS-1716: fixing typo
Correct phrasing of FAQ and add hash key mention

Signed-off-by: Sam Kleinman <samk@10gen.com>
sharded cluster toc edits

Signed-off-by: Sam Kleinman <samk@10gen.com>
minor: changing formating on sharding concepts page
DOCS-1722: fixing broken link
redirect: adding redirect for pdf
sh-reorg: fixing description
minor: removing stale file
minor: build metadata update
build: refactoring json output generation
Fix display consistency of JavaScript code

Signed-off-by: Sam Kleinman <samk@10gen.com>
Update sharding-introduction.txt

/images/sharded-cluster-production-architecture.rst needs to be edited to reflect "Query Router" instead of "Router". It also has a caption that should be updated along the same lines.

Signed-off-by: Sam Kleinman <samk@10gen.com>
minor: tweaking images for router -> query router
minor: formating correction